USHUS is an integrated sonar system developed by the Naval Physical and Oceanographic Laboratory (NPOL) of the Defence Research and Development Organisation (DRDO), India, for use in submarines of the Indian Navy.

It is primarily designed to be used in Sindhughosh class submarines, though it is reported to be fitted in the Arihant-class nuclear-powered ballistic missile submarines as well. USHUS is reported to be superior to its Russian equivalents.

The submarine-sonar, project USHUS being productionised based on transfer-of-technology (TOT) from NPOL by concurrent engineering approach is making rapid progress at BEL, Bangalore.

The order has been placed on production agency by Navy and NPOL is providing technical consultancy and support. One system is being installed and integrated in Russia and the other system is on-board Indian submarines.

Design and Description

USHUS is used for detecting and tracking enemy submarines, surface vessels and torpedoes and can be used for underwater communication and avoiding obstacles.

The sonar can work in both active and passive mode, and is capable of interception and underwater communication.

It can detect both surface ships and submarines at a range of a few kilometers. The team developing the sonar was awarded the Agni Award for self-reliance by the Indian Prime Minister in May 2007.

Production

The production of the sonar is done by Bharat Electronics (BEL) at its Bangalore unit after transfer of technology from NPOL. NPOL continues to provide technical consultancy and support.

The Indian Ministry of Defence signed a contract worth Rs 167 crore with BEL for the delivery of the sonars for four Kilo-class submarines between 2003 and 2007.

Initially one sonar system was installed and integrated in Russia and other system was installed on board an Indian submarine

Current Status
Indian Nuclear Submarine Project starting with INS Arihant (ATV-1) includes advanced USHUS sonar system.

By April 2013, five Sindhughosh class submarines of the navy were upgraded to include the USHUS system. They are, in order of their upgrade, Sindhuvir, Sindhuratna, Sindugosh, Sinduvijay and Sindhurakshak.

INS Sindhukirti was upgraded in India at Hindustan Shipyard. The remaining submarines of the class are expected to follow.